以粒料潤滑裹漿厚度評估混凝土坍度與抗壓強度

Using the Thickness of Lubricating Paste onAggregates toEvaluate the Concrete Slump and Compressive Strength

本文建立粒料粒徑密度函數、重量函數、顆粒函數、表面積函數，積分求出理想總表面積及潤滑裹漿量，相除得到粒料近似單位表面積潤滑漿厚度(LPT)，評估傳統及緻密混凝土坍度與抗壓強度。結果發現厚度和設計值差異在3%內；混凝土無論何種厚度，添加適量的SP劑可以達到15～20 cm坍度；w/cm=0.24〜0.40，厚度越大或低水膠比抗壓強度越高；w/cm=0.32，傳統混凝土(加矽灰)厚度越大(48.3μm)強度仍然越高，但緻密配比，前7天齡期，LPT大者(39.0μm)有較高強度，91天，低LPT(<10μm)配比，粒料緻密堆積與卜作嵐效應，提升晚期強度，兩種配比強度發展趨勢相反。

This paper mainly constructs the aggregate particle density function, weight function, particle functions, the surface area function, integral find the total surface area, pulp division get the approaching of lubricating paste thickness (LPT)on the surface area of aggregates to evaluate traditional and DMDA concrete properties. The results showed that calculated and designed thickness within 3% of the difference; concrete thickness regardless of parcels, add the proper amount of SP could reach 15~20 cm of slump; w / cm = 0.24~0.40, any kind of concrete, low water-cementitious ratio or thicker thickness had the higher compressive strength; w / cm = 0.32, traditional concrete (SF) greater thickness (48.3μm) strength was still higher, but DMDA concrete, before seven days, great LPT(39.0μm)had higher strength, at 91days, lower LPT(10μm), as effect of aggregate dense packing and pozzolanic reaction, could enhance the strength, and the long-term development of two mixs showed opposite trends.